Network Working Group K. Kompella (Juniper Networks)
Internet Draft Y. Rekhter (Juniper Networks)
Expiration Date: January 2002 A. Banerjee (Calient Networks)
J. Drake (Calient Networks)
G. Bernstein (Ciena)
D. Fedyk (Nortel Networks)
E. Mannie (GTS Network)
D. Saha (Tellium)
V. Sharma (Tellabs)
OSPF Extensions in Support of Generalized MPLS
draft-kompella-ospf-gmpls-extensions-02.txt
1. Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet-
Drafts.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as ``work in progress.''
The list of current Internet-Drafts can be accessed at
http://www.ietf.org/ietf/1id-abstracts.txt
The list of Internet-Draft Shadow Directories can be accessed at
http://www.ietf.org/shadow.html.
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2. Abstract
This document specifies encoding of extensions to the OSPF routing
protocol in support of Generalized Multi-Protocol Label Switching
(GMPLS). The description of the extensions is specified in [GMPLS-
ROUTING].
3. Summary for Sub-IP Area
3.1. Summary
This document specifies encoding of extensions to the OSPF routing
protocol in support of Generalized Multi-Protocol Label Switching
(GMPLS). The description of the extensions is specified in [GMPLS-
ROUTING].
3.2. Where does it fit in the Picture of the Sub-IP Work
This work fits squarely in either the CCAMP or OSPF box.
3.3. Why is it Targeted at this WG
This draft is targeted at the CCAMP or the OSPF WG, because this
draft specifies the extensions to the OSPF routing protocols in
support of GMPLS, because GMPLS is within the scope of the CCAMP WG,
and because OSPF is within the scope of the OSPF WG.
3.4. Justification
The WG should consider this document as it specifies the extensions
to the OSPF routing protocols in support of GMPLS.
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4. Introduction
This document specifies extensions to the OSPF routing protocol in
support of carrying link state information for Generalized Multi-
Protocol Label Switching (GMPLS). The set of required enhancements to
OSPF are outlined in [GMPLS-ROUTING].
5. OSPF Routing Enhancements
In this section we define the enhancements to the TE properties of
GMPLS TE links that can be announced in OSPF TE LSAs. The Traffic
Engineering (TE) LSA, which is an opaque LSA with area flooding scope
[3], has only one top-level Type/Length/Value (TLV) triplet and has
one or more nested TLVs for extensibility. The top-level TLV can
take one of two values (1) Router Address or (2) Link. In this
document, we enhance the sub-TLVs for the Link TLV in support of
GMPLS. Specifically, we add the following sub-TLVs:
1. Outgoing Interface Identifier,
2. Incoming Interface Identifier,
3. Link Protection Type,
4. Shared Risk Link Group, and
5. Interface Switching Capability Descriptor.
This brings the list of sub-TLVs of the TE Link TLV to:
Sub-TLV Type Length Name
1 1 Link type
2 4 Link ID
3 4 Local interface IP address
4 4 Remote interface IP address
5 4 Traffic engineering metric
6 4 Maximum bandwidth
7 4 Maximum reservable bandwidth
8 32 Unreserved bandwidth
9 4 Resource class/color
11 4 Outgoing Interface Identifier
12 4 Incoming Interface Identifier
14 4 Link Protection Type
16 variable Shared Risk Link Group
15 variable Interface Switching Capability Descriptor
32768-32772 - Reserved for Cisco-specific extensions
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5.1. Outgoing Interface Identifier
An Outgoing Interface Identifier is a sub-TLV of the Link TLV with
type 11, length 4, and value equal to the assigned identifier.
5.2. Incoming Interface Identifier
An Incoming Interface Identifier is a sub-TLV of the Link TLV with
type 12, length 4, and value equal to the assigned identifier.
5.3. Link Protection Type
The Link Protection Type is a sub-TLV of the Link TLV, with type 14,
and length of four octets, the first of which is a bit vector
describing the protection capabilities of the link. They are:
0x01 Extra Traffic
0x02 Unprotected
0x04 Shared
0x08 Dedicated 1:1
0x10 Dedicated 1+1
0x20 Enhanced
0x40 Reserved
0x80 Reserved
5.4. Shared Risk Link Group (SRLG)
The SRLG is a sub-TLV of the Link TLV with type 16. The length is the
length of the list in octets. The value is an unordered list of 32
bit numbers that are the SRLGs that the link belongs to. The format
is as shown below:
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0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 16 | 4 * No. of SRLGs in link |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Shared Risk Link Group Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| ............ |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Shared Risk Link Group Value |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
5.5. Interface Switching Capability Descriptor
The Interface Switching Capability Descriptor is a sub-TLV of the
Link TLV with type 15. The length is the length of value field in
octets. The format of the value field is as shown below:
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Switching Cap | Encoding | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 0 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 3 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 4 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 5 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 6 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max LSP Bandwidth at priority 7 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Switching Capability-specific information |
| (variable) |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Switching Capability (Switching Cap) field contains one of the
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following values:
1 Packet-Switch Capable-1 (PSC-1)
2 Packet-Switch Capable-2 (PSC-2)
3 Packet-Switch Capable-3 (PSC-3)
4 Packet-Switch Capable-4 (PSC-4)
51 Layer-2 Switch Capable (L2SC)
100 Time-Division-Multiplex Capable (TDM)
150 Lambda-Switch Capable (LSC)
200 Fiber-Switch Capable (FSC)
The Encoding field contains one of the values specified in Section
3.1.1 of [GMPLS-SIG].
Maximum LSP Bandwidth is encoded as a list of eight 4 octet fields in
the IEEE floating point format, with priority 0 first and priority 7
last.
The content of the Switching Capability specific information field
depends on the value of the Switching Capability field.
When the Switching Capability field is PSC-1, PSC-2, PSC-3, PSC-4, or
L2SC, there is no specific information.
When the Switching Capability field is TDM, the specific information
includes Minimum LSP Bandwidth, which is is encoded in a 4 octets
field in the IEEE floating point format.
When the Switching Capability field is LSC, there is no specific
information.
6. Security Considerations
The sub-TLVs proposed in this document does not raise any new
security concerns.
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7. Acknowledgements
The authors would like to thank Suresh Katukam, Jonathan Lang and
Quaizar Vohra for their comments on the draft.
8. References
[OSPF-TE] Katz, D., Yeung, D., "Traffic Engineering Extensions to
OSPF",
draft-katz-yeung-ospf-traffic-04.txt (work in progress)
[GMPLS-SIG] "Generalized MPLS - Signaling Functional
Description", draft-ietf-mpls-generalized-signaling-04.txt (work
in progress)
[GMPLS-ROUTING] "Routing Extensions in Support of Generalized MPLS",
draft-many-ccamp-gmpls-routing-00.txt
9. Authors' Information
Kireeti Kompella
Juniper Networks, Inc.
1194 N. Mathilda Ave
Sunnyvale, CA 94089
Email: kireeti@juniper.net
Yakov Rekhter
Juniper Networks, Inc.
1194 N. Mathilda Ave
Sunnyvale, CA 94089
Email: yakov@juniper.net
Ayan Banerjee
Calient Networks
5853 Rue Ferrari
San Jose, CA 95138
Phone: +1.408.972.3645
Email: abanerjee@calient.net
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John Drake
Calient Networks
5853 Rue Ferrari
San Jose, CA 95138
Phone: (408) 972-3720
Email: jdrake@calient.net
Greg Bernstein
Ciena Corporation
10480 Ridgeview Court
Cupertino, CA 94014
Phone: (408) 366-4713
Email: greg@ciena.com
Don Fedyk
Nortel Networks Corp.
600 Technology Park Drive
Billerica, MA 01821
Phone: +1-978-288-4506
Email: dwfedyk@nortelnetworks.com
Eric Mannie
GTS Network Services
RDI Department, Core Network Technology Group
Terhulpsesteenweg, 6A
1560 Hoeilaart, Belgium
Phone: +32-2-658.56.52
E-mail: eric.mannie@gtsgroup.com
Debanjan Saha
Tellium Optical Systems
2 Crescent Place
P.O. Box 901
Ocean Port, NJ 07757
Phone: (732) 923-4264
Email: dsaha@tellium.com
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Vishal Sharma
Jasmine Networks, Inc.
3061 Zanker Rd, Suite B
San Jose, CA 95134
Phone: (408) 895-5000
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